This book only partially worked for me. Rory and Kestrel were strong characters, and I would have really enjoyed them more if I felt I got to know them better. Both seemed mono-dimensional. I never really felt I knew Rory at all and Kestrel (for me a dumb and really 'twinky' name--though I get the meaning) was distant.
I found the dialog confusing. There were large sections I needed to re-read because I just couldn't follow who was speaking. Whether it was bad paragraphing or lack of dialog tags, I just didn't follow large sections.
Another really huge irritation for me was the whole French sub-plot. While I know nothing about mountain climbing and am not a person who engages in high-trill adventures, I find it totally inconceivable that a supervisor would subject one of his team members in some 'test' that would in any way compromise his safety.
[Suppose Kestrel had become injured or heaven forbid lost his life because of a "psychological test" or to be more specific, a "trick." It would have been far more than tragic.
The ending was romantic but went kind of flat. One moment they were chatting with the French duo; the next they were jerking each other off. Where did that come from?? Like...how about getting undressed first, or something.
While this story wasn't bad, it had potential, but it just didn't make it for me. Too bad.